It exists an ebook that is a must read for you, it's author is Joel Comm (an especialist writter of New York Times). If you are using adsense on your site, you cannot miss this ebook which will let you earn lots of money optimizing adsense aspects and codes.

We won't publish the whole book due to legal terms but we post the introduction written by Joel Comm:

"INTRODUCTION

In January 2005 I published an ebook called AdSense Secrets: What Google Never Told You AboutMaking Money with AdSense. The book explained everything I’d discovered over the previousmonths while testing and experimenting with Google’s AdSense system.

It contained all the strategies, ideas, methods and approaches that I was using on my websites togenerate five- figure checks every month from Google.

The book was just 66 pages long — but as soon as it hit the Web, it sold like hotcakes. Internetpublishers couldn’t download it fast enough. They wanted to know what AdSense could do for them.The success of that first edition took me by surprise. I was stunned at the rate at which people snappedit up.

In retrospect I shouldn’t have been surprised at all. Google had launched AdSense in June 2003,eighteen months before the ebook came out. Until then, Google had been known mainly as a searchengine that produced better results than AltaVista and was easier to use than Yahoo (which shows howlong ago 2003 was!). It was running ads on its search results, which seemed to be doing well, but noone was sure what effect its contextual advertising program would have or whether it would bebeneficial to anyone.

There was a lot of suspicion — and for good reason. It hadn’t been long since the Internet bubble hadburst, shattering dreams of dotcom fortunes and wiping out millions of dollars of venture capital.After being told that buying a domain and picking up users would build an asset that could be sold forenough cash to buy a house in Cancun — heck, to buy half of South America — Internet companiessuddenly discovered they didn’t have enough money to meet payroll.

I was just a small publisher when the crash happened, but I wasn’t the only one wondering what to donext.

So when a company produced a product that promised it would change the Web, turn websites intocash cows, and allow people to give away content and still earn money, it was hardly surprising that itmet with a touch of cynicism.

We’d heard it before.

Critics wondered whether Google would be able to parse pages well enough to serve ads that usersfound helpful.

Experts questioned whether Google would be able to pick up enough inventory to fill all of the slotsthat would become available on the Web if anyone could place ads on their pages that easily.And writers noted that contextual ads were all well and good, but it was user behavior that matteredmore. A site about literature, for example, might serve ads for first editions but if it’s used by readerswho have come from music sites, it might be smarter to serve ads for study guides and student loans.Google wasn’t tracking that data. (They do now!)

My first experiments with AdSense suggested that the critics were right. AdSense was a waste of time.

My Experiments with AdSense

I signed up with AdSense in June 2003, as soon as it became available, serving AdSense off just a fewof the pages on my early websites.

By the end of my first day with AdSense, I'd delivered several thousand AdSense impressions andearned the princely sum of… $3.00. I didn’t exactly burn down the house.I didn’t see a great deal of potential based on that figure, but I figured it couldn’t hurt to place theAdSense code on more pages. Over the next couple of months, I increased my impressions 25-fold.But my earnings didn’t go up 25-fold. The ads were on my site and people were seeing them, but noone was clicking them. And because of the way that Google was paying for the ads — on a cost-perclick(CPC) basis rather than the old cost-per-mille basis that paid a set amount for every thousandimpressions whether users clicked them or not — those ads weren’t making money. My click-throughratios were so bad I needed thousands of visitors to net just $30 per day.

So I took the code off.

That was a big mistake. Just how big came clear a few months later.In April 2004, ten months after signing up for AdSense, I attended an Internet conference. There wereabout two dozen entrepreneurs there, all looking for ways to make money online. As I was sitting inthe conference room, the person next to me had his laptop open and was looking at his AdSensereport.

I could see he was making between $200 and $300 a day — more than ten times what I’d made on oneof my best days!

It was one of those eureka moments, one of those times when you wonder how you could have missedsomething so obvious and so good.

I pulled out my own laptop and right there in that conference room I did what I should have done atthe beginning. I started playing with my AdSense code.

I looked again at the different ad unit sizes. I tried out different color schemes. And I adjusted wherethe ads appeared on the page.

That day, my AdSense income rocketed to $80, about four times a typical day’s earnings that I hadbeen making until then from AdSense. All of those impressions I’d been generating were starting toconvert into clicks — and those clicks were bringing me real money.

That was when I realized that there really was something to AdSense, that this system really did havethe ability to change the Internet.

It could let publishers write about whatever they want, give their content away for free, and still makeenough money from advertising to make a very good living.

The critics were wrong. I’d been wrong. AdSense could work.

So far though, I’d just made a few quick changes to my AdSense units, based on instinct and curiosity.If I was going to maximize my earnings, I needed to know which were the best places on the page forwhich ad formats, in which colors and on what content. I wanted to understand exactly how AdSenseworked so that I could be sure that my Web pages were always making all the money they could.Guesswork is fine when you want to play, but I was trying to build an Internet business and that meanttaking measurements, keeping records and coming up with strategies that had predictable, repeatableresults. I needed to take an industrial approach to my revenues in the same way that a retail store tracks sales to knowwhich products are the most popular and which shelves they need to put them on.

So I kept testing. I kept trying new strategies and I kept notes of everything that happened. When anidea succeeded, I extended it to all of my other ads. When it failed, I made a note, and dropped it.After a few months I was making $500 a day from AdSense and sometimes even $1,000.And I found that once the ads were optimized, I didn't have to do another thing. As long as I continuedto put up content, the ads — and the revenues — would take care of themselves.

I wasn’t the only one doing this though. Internet forums at the time were filled with people swappingideas about what they had found worked for them while using AdSense. Whenever someone came upwith an optimization technique that worked, they’d put it on a forum. Whenever someone asked howthey could increase their earnings, their question would pick up a long list of answers.

I was sharing my findings too but the forums weren’t particularly userfriendly. If you were alreadyusing AdSense, the Internet marketing forums could help with troubleshooting and provide ideas tosqueeze more money out of a site. But for people starting up, it was a horrible experience. Theforums weren’t guides, and they weren’t meant to be.

A lot of the people I knew, though, needed information that was easier to use. They wanted to knowwhat AdSense was and how it worked.

That was why the first edition of this book was such a success. Publishers were beginning to realizethat AdSense could bring their sites money. It could do everything that the Web had promised in termsof freedom, independence, enjoyment and revenues, too.

That hunger to learn hasn’t changed.

If anything, it’s grown as increasing numbers of people have come to understand what AdSense is,what it can do and what it can do for them.

And so I welcome you to the 6th expanded and updated edition of the world’s most-read book on howto make money with Google AdSense!"